But when I create the button like this in the viewDidLoad method I can't reference it in other methods in the same class. Let's say I want to change the ImageView alpha to 0.0f in an IBAction method in the same class. I can' just reference to imageview like this:

-(IBAction) button {
imageview.alpha = 0.0f;
}

What is the easiest thing to do with the ImageView if I want to reference it in another method?